Which is not unique to each element?
a. proton number
b. atomic number
c. neutron number
d. chemical symbol

your answer is D

This is because each element has its own atomic number and it doesnt repeat. Same with the protons and neutrons, thats what makes it special.

But the symbol has nothing to do with the element and can be used to represent any other element.

Hope this helps you out!!

:)))

true tan speed = ang vel x radius

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.